//StringMutation.java             Author:lixinyu
//Domentrates the use of the string class and its methods.
public class StringMutation
{
 //Prints a string and various mutations of it.
 public static void main(String []args)
 {
   String phrase = "Change is inevitable";
   String mutation1,mutation2,mutation3,mutation4;

   System.out.println("Origanal string:\""+phrase+"\"");
   System.out.println("Length of string:"+phrase.length());

   mutation1 = phrase.concat(",expect from vending machines.");
   mutation2 = mutation1.toUpperCase();
   mutation3 = mutation2.replace('E','X');
   mutation4 = mutation3.substring(3,30);

   //print each mutated
   System.out.println("Mutation #1" +mutation1);
   System.out.println("Mutation #2" +mutation2);
   System.out.println("Mutation #3" +mutation3);
   System.out.println("Mutation #4" +mutation4);

   System.out.println("Mutated length:"+ mutation4.length());
   }
  } 
   
